--- x/drivers/net/usb/cdc_ncm.c
+++ y/drivers/net/usb/cdc_ncm.c
@@ -1017,6 +1017,7 @@ void cdc_ncm_unbind(struct usbnet *dev,
 		ctx->control = NULL;
 	}
 
+	dev->data[0] = 0;
 	usb_set_intfdata(intf, NULL);
 	cdc_ncm_free(ctx);
 }